Save file to output folder creating it if it does not exist

Question

I'm using the pathlib library to handle I/O in my script. I read a file with the path:

PosixPath('input/ADE/data_f34.dat')

The parent folder input/ is fixed, but neither the sub-folder (ADE) nor the file's name are fixed, i.e., they change with each iteration. I need a general to store a new file with the same name, to the path:

PosixPath('output/ADE/data_f34.dat')

I.e., respecting the sub-folder and the file's names, but changing input/ to output/. The output folder always exists, but I don't know a priori if the sub-folder output/ADE/ exists so I need to create if it does not. If a file with the same name already exists, I can simply overwrite it.

What is the proper way to handle this with pathlib?

Balaji Ambresh · Accepted Answer · 2020-07-14 14:39:25Z

2

Is this what you're looking for?

import pathlib

src = pathlib.PosixPath('input/ADE/data_f34.dat')
dst = pathlib.Path('output', *src.parts[1:])
dst.parent.mkdir(parents=True, exist_ok=True)
with open(dst, 'w') as d, open(src) as s:
    d.write(s.read())

answered Jul 14, 2020 at 14:39

Balaji Ambresh

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hurlenko · Accepted Answer · 2020-07-14 14:54:04Z

1

You can use relative_to:

from pathlib import PosixPath

filename = PosixPath('input/ADE/data_f34.dat')
output_dir = PosixPath('output')

path = output_dir / filename.relative_to('input')
path.parent.mkdir(parents=True, exist_ok=True)

print(path)

Prints

output/ADE/data_f34.dat

edited Jul 14, 2020 at 14:54

answered Jul 14, 2020 at 14:44

hurlenko

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1 Comment

Balaji Ambresh Over a year ago

You might want to add the rest of the code to safely create parent directories.

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